The fine levied by U.S. District Judge Brian Morris in Great Falls on Thursday was recommended in a plea deal between federal prosecutors and company attorneys.
The company pleaded guilty to negligently discharging oil into waters of the United Sates and to failing to immediately notify federal officials.
A cracked pipe in an oil field on the Blackfeet Indian Reservation led to the spill of up to 840 gallons of oil and production fluid, which spread nearly a mile to Cut Bank Creek.
The company previously spent $321,000 on the cleanup.
As part of the plea deal, federal prosecutors dropped charges against FX Drilling supervisor Quay Torok.